IPhonePackager.exe RepackageFromStage Failed with UE5.6 & MacOS26.0.1 & Xcode 26.0.1

Development Platform & Builds Mobile
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Today am upgrade macos and xcode. but remote build ios with IPhonePackager.exe RepackageFromStage Failed

Saving IPA …
… Writing updated Info.plist
Opening source executable…
… Processing one mach object (binary is thin)
… Initial signature step (11.27 s elapsed so far)
… Computing hashes (11.32 s elapsed so far)
… Final signature step (11.93 s elapsed so far)
IPP ERROR: Application exception: System.IO.InvalidDataException: CMS signature blob size is too large for the allocated size, unable to create useful code signing data
在 iPhonePackager.CodeSignatureBuilder.PerformSigning() 位置 D:\Engine\Source\Programs\IOS\iPhonePackager\CodeSigning.cs:行号 1013
在 iPhonePackager.CookTime.RepackageIPAFromStub() 位置 D:\Engine\Source\Programs\IOS\iPhonePackager\CookTime.cs:行号 355
在 iPhonePackager.Program.Main(String args) 位置 D:\Engine\Source\Programs\IOS\iPhonePackager\iPhonePackager.cs:行号 973

Anybody with the same facult. help me please

2

Hello there @thinkthen!

Checking with my peers, the key error in your extract should be the following:

IPP ERROR: Application exception: System.IO.InvalidDataException: CMS signature blob size is too large for the allocated size, unable to create useful code signing data

This issue refers to a recent conflict between UE’s IPhonePackager and the latest versions of Xcode, as it’s signature has changed to a larger structure. When UE attempts to read the format, it can’t handle the larger signature blobs, resulting in a crash.

The solution here would be to roll back your update, and go back to the previous version of Xcode you were using, until a hotfix is deployed on Epic’s end. And once you do the downgrade, please ensure that your cache’s project is cleared, either by using “Clean Build Folder”, or manually deleting folder “DerivedData”.

3

first, thanks for you reply.

am attep to use the macos26 and old xcode16.2 with the same situation.

cd /Users/oooo/UE5/Builds/PC-2025RLHYJB/D/D:/Intermediate/ProjectFilesIOS
/Applications/Xcode.app/Contents/Developer/usr/bin/actool --output-format human-readable-text --notices --warnings --export-dependency-info
/* com.apple.actool.errors /
/Users/oooo/UE5/Builds/PC-2025RLHYJB/D/D:/UnrealEngine/Engine/Build/IOS/Resources/Assets.xcassets: error: Failed to launch AssetCatalogSimulatorAgent via CoreSimulator spawn
Underlying Errors:
Description: Failed to handshake with platform tool
Failure Reason: Failed to open connection over FIFOs with platform tool
Underlying Errors:
Description:
Recovery Suggestion: Try restarting your computer
Underlying Errors:
Description: Failed to open FIFOs for handshaking with platform tool
Failure Reason: AssetCatalogSimulatorAgent exited before we could handshake
/ com.apple.actool.compilation-results */